hi bro. actually it is quite subjective. every setup has their own pros and cons. but actually i prefer to use skunk2 intake and oversized throttle body. it is because the tuning part wont be as hard as tuning the 4 throttle aka ITBs. ITBs is the ultimate intake setup for NA engine but the tuning is very hard. Wrong setting then you can lose power instead of gain power. So, ITB need more than just the adapter and the 4 throttle unit. u must also have good management system :)

currenly i'm using std mivec intake and throttle body. last time i used honda intake and super90 70mm throttle body for my 93 non mivec setup. all i can say that, the honda and oversize tb is very good and produce good high end power. but bare in mind that my car last time was on highcams and port polish cylind head. i dont know whether it will gives better performance if ur engine is still stock.

btw, for your 91, i would recommend to do some simple mods first such as, plugs, plug cables, mivec tb, adjustable campulley, lighten crankpulley, 4-2-1 header and 2 inch piping, it will gives better performance for your 91.